{"id":"F2006B06132","name":"AD/PC-6/29 - Propeller Anti-Reversing Switch - Inspection and Replacement","slug":"ad-pc-6-29-propeller-anti-reversing-switch-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46911,"registerId":"commonwealth-F2006B06132-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-6/29 - Propeller Anti-Reversing Switch - Inspection and Replacement","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Pilatus Porter PC-6 Series Aeroplanes\n\n \n\nAD/PC-6/29 Propeller Anti-Reversing Switch - Inspection\n\nand Replacement\n\n\n9/70\n\n \n\nApplicability: Pilatus Production S/Nos. 1 to 711. Fairchild Hiller Production S/Nos. 2001, 2004 to 2010 and 2040.\n\n \n\nDocument: Pilatus SB No. 100.\n\n \n\nCompliance: As detailed in requirement document.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive targeting a specific mechanical component on specific aircraft serial numbers. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 defined elements: applicability (serial number ranges), document reference, compliance method, and subject matter","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No conditional logic or nested exceptions — simple mandatory compliance structure","Single technical requirement with clear reference to external standard (Pilatus SB No. 100)"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for specific **Pilatus Porter PC-6 aircraft**.\n\n**What it does:**\n- Requires owners and operators of certain PC-6 aeroplanes to inspect and replace the **propeller anti-reversing switch** — a safety device that prevents the propeller from accidentally going into reverse thrust during flight.\n\n**Who it affects:**\n- Owners and operators of Pilatus PC-6 aircraft with specific serial numbers:\n  - Pilatus-built planes: serial numbers 1 through 711\n  - Fairchild Hiller-built planes: serial numbers 2001, 2004–2010, and 2040\n\n**Why it matters:**\n- A faulty anti-reversing switch could allow the propeller to reverse unexpectedly, potentially causing loss of control or an accident. This directive ensures the switch is checked and replaced as needed to keep the aircraft safe to fly.\n\n**What must be done:**\n- Follow the instructions in **Pilatus Service Bulletin No. 100** (the technical document referenced) to complete the inspection and any necessary replacement."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The text contains no indication that the applicability or requirements have been expanded or narrowed relative to an earlier version. The AD explicitly applies to the listed serial numbers and requires compliance as detailed in Pilatus SB No. 100 (Applicability; Document; Compliance)."},"complexity_factors":["Narrow applicability limited to specific serial number ranges (Applicability)","Mandatory compliance but procedural detail deferred to an external document (Pilatus SB No. 100) (Document; Compliance)","Reliance on owners/operators to obtain and follow the service bulletin (Document)","Potential need for parts, qualified maintenance and scheduling that are not described in the AD (Applicability; Document)","No alternative methods or contingencies described in the AD text (Compliance)"],"plain_english_summary":"This AD requires owners/operators of specific Pilatus PC‑6 airframes (listed serial numbers) to inspect—and if the inspection warrants, replace—the propeller anti‑reversing switch, with compliance carried out per Pilatus Service Bulletin No. 100. It creates a legal maintenance obligation for those registered owners, who must obtain the bulletin, schedule and fund inspections, parts and labour, and follow the manufacturer’s procedures to satisfy the directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-6-29-propeller-anti-reversing-switch-inspection-and-replacement","history":"/api/acts/ad-pc-6-29-propeller-anti-reversing-switch-inspection-and-replacement/history","analysis":"/api/acts/ad-pc-6-29-propeller-anti-reversing-switch-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-pc-6-29-propeller-anti-reversing-switch-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-pc-6-29-propeller-anti-reversing-switch-inspection-and-replacement/important-cases","documents":"/api/acts/ad-pc-6-29-propeller-anti-reversing-switch-inspection-and-replacement/documents"}}